HOW TO MAKE HEART RATE MONITOR RECEIVER By RICK MOLL?-BIOMEDICAL PROJECTS

IDEA

Commercial HRM transmitters are available from several manufacturers. The HRM receiver

described here allows these transmitters to be interfaced to a small microcontroller or PC.



The HRM receiver is built on a 2.5 x 1.8 inch printed circuit board. It can be interfaced to just about any microcontroller that has an analog input. It will operate from the same 5V supply that powers the microcontroller. With each heart beat signal it receives from a wireless HRM transmitter, it outputs an analog pulse. These pulses are typically sampled with a microcontroller ADC port.

HRM Transmitter

This wireless HRM transmitter was manufactured by Polar, who claims to be the world's leading producer of wireless HRM equipment. Cardiosport and Sports Instruments manufacture similar equipment.

These transmitters are worn around the chest and generate a 5kHz magnetic pulse with each heart beat they detect. The transmitted magnetic signals are fairly weak, but typically have a range of over 3 feet.

These HRM transmitters can be purchased for as little as $40 (USD), or along with a no frills wrist style receiver for around $50 (USD).

circuit description

schematic

code


for any further querry contact the administrator

USB BASED ECG ACQUISITION SYSTEM - BIOMEDICAL PROJECTS

[caption id="" align="aligncenter" width="300" caption="Image via Wikipedia"][/caption]

SOMETHING ABOUT PROJECT

Acquisition of ECG data from patients in Intensive Care Unit (ICU) following surgery is a vital part of cardiac disease detection and rehabilitation monitoring and therefore it is a standard function of ICU physiological monitors and monitoring systems. Recently, some authors
have introduced continuous ECG monitoring and processing into cardiac disease prediction research. Such studies have to be performed on as many subjects as possible in order to acquire large enough amount of data, which imposes a necessity for simultaneous data acquisition from multiple patients. Current equipment found in a typical ICU is not designed to fulfill such demands and usually cannot be easily interfaced to a standard computer intended
for signal data recording. The aim of this project was to design and develop a simple ECG acquisition system composed of a single recording and storage device (personal computer) and a sufficient number of pickup ECG amplifiers simultaneously connected to the recording device on a single bus. We chose USB for interconnecting the system because of its speed, reliability and power-supply and plug and play capabilities. USB is widely spread and every modern computer has multiple USB ports used for connecting peripheral devices and as such it fulfilled the demands of our project.  In order to allow complete control of the recording device to amplifier interface we developed custom USB drivers designed for Microsoft Windows XP operating System. The system was evaluated with eight amplifiers working simultaneously and no data loss was detected.

DOWNLOAD THE COMPLETE ONE